Lens with optical area to increase defocus image area

Abstract

A lens with an optical area to increase a defocus image refractive powers is disclosed. A central optical zone of the lens includes a non-circular optical area, and a defocus area formed on a part thereof other than the optical area. An outer surface of the peripheral optical zone is aspheric, so that the original space of the central optical zone can be effectively used to increase the defocus image area of the retina of eye ball and light passing the peripheral optical zones can create different amounts of peripheral blurring areas in front of different areas of the retina; this defocusing of the images, providing more controlled amount of myopic defocus to the retina, which acts as a putative cue to slow myopic eye growth.

What is claimed is: 
     
         1 . A lens with optical area to increase defocus image area, comprising:
 an outer surface;   an inner surface;   a central optical zone formed on the outer surface and the inner surface and configured to pass light to clearly focus on a central imaging area of a retina of eyeball; and   peripheral optical zones surrounding the central optical zone and configured to pass light to focus on a peripheral blurring area around the central imaging area, wherein the peripheral optical zones include aspheric outer surfaces configured to pass light to focus in front of the peripheral blurring area of the retina; and   a plurality of position-limiting grooves formed on the surface of the lens and configured to prevent the myopia control lens from rotating;   wherein the central optical zone comprises an optical area and a defocus area, and the optical area is formed on a surface of the central optical zone and configured to pass light to clearly focus on the central imaging area of the retina of the eyeball, and the defocus area is formed on a part of the surface of the central optical zone other than the optical area and configured to increase defocus image area of the central imaging area;   wherein eccentricity of the outer surface of the central optical zone is less than eccentricity of the outer surfaces of the peripheral optical zones.   
     
     
         2 . The lens with optical area to increase defocus image area according to  claim 1 , wherein the lens is a lens of a contact lens or a lens of an eyeglass. 
     
     
         3 . The lens with optical area to increase defocus image area according to  claim 1 , wherein the inner surface is spherical. 
     
     
         4 . The lens with optical area to increase defocus image area according to  claim 1 , wherein the outer surface of the central optical zone is aspheric. 
     
     
         5 . The lens with optical area to increase defocus image area according to  claim 1 , further comprising a non-optical zone surrounding the peripheral optical zone. 
     
     
         6 . The lens with optical area to increase defocus image area according to  claim 1 , wherein the lens power of the peripheral optical zone is in range of 0.00 diopter to −20.00 diopter, and the eccentricity of the peripheral optical zone is in range of 0 to −1.740. 
     
     
         7 . The lens with optical area to increase defocus image area according to  claim 1 , further comprising a joint section jointed between the outer surfaces of the central optical zone and the peripheral optical zone, and eccentricity of the joint section is between the eccentricity of the outer surface of the central optical zone and the eccentricity of the outer surface of the peripheral optical zone. 
     
     
         8 . The lens with optical area to increase defocus image area according to  claim 1 , wherein the optical area of the central optical zone is elliptic. 
     
     
         9 . The lens with optical area to increase defocus image area according to  claim 1 , wherein the optical area and the defocus area of the central optical zone are formed on the outer surface of the lens. 
     
     
         10 . The lens with optical area to increase defocus image area according to  claim 1 , wherein the optical area and the defocus area of the central optical zone are formed on the inner surface of the lens. 
     
     
         11 . The lens with optical area to increase defocus image area according to  claim 1 , wherein each of the outer surface and the inner surface is formed with the optical area and the defocus area. 
     
     
         12 . The lens with optical area to increase defocus image area according to  claim 1 , wherein the optical area has a plurality of convex parts extended in horizontal direction. 
     
     
         13 . The lens with optical area to increase defocus image area according to  claim 12 , wherein the plurality of convex parts of the optical area are extended to periphery of a central optical zone. 
     
     
         14 . The lens with optical area to increase defocus image area according to  claim 1 , wherein each of a plurality of convex parts of the optical area has a circular-arc-shaped corner. 
     
     
         15 . The lens with optical area to increase defocus image area according to  claim 1 , wherein refractive powers of the defocus area of the central optical zone and the peripheral optical zone are lower than refractive power of the optical area, and the refractive power of the defocus area is equal to the refractive power of the peripheral optical zone. 
     
     
         16 . The lens with optical area to increase defocus image refractive powers according to claim  1 , wherein the plurality of position-limiting grooves is formed on an edge of the inner surface.